Scarifier



Nov. 6, 1923. 1,473,003

' E. E. BERRY SCARIFIER Filed Dec. 1, 1920 4 Sheets-Sheet 1 E. EKBERRYSCARIFIER 1. 1920 4 Sheets-Sheet 2 iled Dec,

/yro 52v! 5.296

Nov. ,6 19

E. E. BERRY Nov. 6 1923.

SGARIFIEH 4 Sheets-S1eet 5 Filed Dec 1, 1920 fczrl E. 561* 1,473,003 E.E. BERRY SCARIFIER Filed Dec. 1. 1920 4 Sheets-sheaf. 4

Patented Nov. 6, 1923.

warren srr' emcee 551%.." l

ARL E- BE Y r KENNE amar EN i e e AS I NQR AME AN ROAD MACHINERYCOMPANY, ne or KENNETT SQUARE, rnNns YLv nrA, A conm ri OF DEL WARSCARIFI-ER.

Application filed December 1, .1920. .Serial No. 427,494.

To aZZ whomz't may concern:

Be it known that I, EARL E. BERRY, a

citizen of the United States, residing at, Kennett Square, county ofChester, and r 6 State of Pennsylvania, have invented anew and usefulImprovement in Scarifiers, of

which the following. is a full, clear, and exact description, referencebeing hadto the accompanying drawings, which form a part .of thisspecification.

This invention ,relates to an improvement in fluid pressure actuating.scarifiers, and more particularly to devices of this type which areattached to road machinery or steam-rollers for tearing up the surfaceof roads prior .to paving.

The object of my invention isto provide a simple and efiicient device ofthis character in which the teeth of the scarifier are rotated about theaxis of their support to raise the points of the teeth above theplane ofthe supporting wheels of the scarifier, when out of operation, andthereby reduce the required movement of the scarifier when shifting itfrom its operative position to its inoperative position, andat theSametime provide sufficient clearance between the points of the teethand the ,road when the scarifier is in its raisedorinoperative posi- 80tion.

Another object of.my inv,enti0n is to so mount the cylinder for raisingand lowering the scarifier, from its operative to itsinoperative,position orvice versa,.that I. am enabledto :form a direct connectionbetween the, operating piston in the cylinder and the scarifier by meansof the piston rod, and toso mount thescarifierthat the teeth will beautomatically positioned by the direct action of the piston red whenraisingthe scarifier.

A further object of my invention is to provide means whereby the angle.ofthe teeth can readily be changed to vary the pitch ofthe teeth inaccordance with the surface tobe scarified. v

The precise nature of my invention will behest understood by referenceto;the accompanying drawings, which will now .be described, it beingpremised,;however, that various changes may be made in;the,details ofvconstruction withoutv departing from the spirit and scope. ofmyinvention as. defined in the appended claims.

as Fig.1 of the drawings is arear viewof a in its inoperative position.

portion of a road .roller withone formof scarifier made in accordancewithsmy invention attached thereto. v

Fig. 2 is a sectional view on the line of F l. l i

Fig. 3is a detail sectional view on the line 3 3 of F ig. Fig. 4L- is asimilar view with thefscarifier Fig. 5 is a detailsectional View on theline 5,5 of device.

Fig. 6 is a detail sectional ,view on the .line 6-6 of Fig. 1, showing afiller .block in position to varythe angle .ofthe'lteeth." Fig. 7 is asectionallview through ,one form of valve forcontrolling the admissionof pressure fluidto the cylindenand thelexhaust therefrom. i'

In the drawings, the reference character '10 designates the rear ofasteam roller or road .machine, which :is supported pale usual manner onwheels wliich are driven by power to move the machine overtlie road, and10 the drivers entrance at the mats shown in Fig. 1. -11 are bracketssecured to the frame 12 ofthe roller. l3 is'a shaft mounted therein (andT which extends beyond the-brackets as shown inFig. 1.

'Mounted on the ends of v the shaft vl3 are draw for draglbar's' 14, theouter ends of which are 'bored out'to lrecei've trunnions 15 on theendsof atool bar 16, a nd 17 are scarifying teeth ortoolssec'uredfto'th'e.tool bar, by' means of screv'v" clamps 18. teethortools aresquare incross-section and are pointed at both ends fso as ,topermit Fig. 4, illustratingthe locking reversinggwhen one of'tliepointsis broken offer blunted. The tool bar 16 ,aiid tlie clamps areprovided with.V;shapTed recesses which together form sockets fforltheYteth. As the depthiof these .V'-shaped recessesfis less thanone-half'jhe greatest'diameter of the teeth, the teeth can be securelyclamped in their adjustedpositions by, the 'clanips ;l8.

19 is afiuid pressurejcylinder, havingian upper cylinder head"20,..provided ,witha bearing for a shaft 21,.whichis mounted inbrackets 22 secured to.thefframeof.the roller, the arrangement being.such'lthat the cylinder 19 is suspended from. the roller in such amanner that it-can freely oscillate with relation thereto. I

The lowerendof th cylinder isalsoprovidedwith a head 23,..and24isapis'ton stuffing box on-the cylinder head 23, and.

which rod is pivotally connected at its lower end to the tool bar 16 bya pinn26'h The axis of the pin 26 is eccentric to the trunnions 15 topermit the tool bar to be swungabout the axis of the trunnions 15 by themovement of the piston2et, as hereinafter set forth.

Pivotally mounted on the trunnions 15 are wheels27 which support thetoolbar 16 when in operative position, and the depth to which the teethenter the ground when the scaritier is moved ahead by the roller.

28 and 29 are stops on the drag-bars 1%, which are engaged by stops30on'the tool bar 16, the stops 28 being arranged to limit themovementof thetoolbar 16 about the axis of the trunnions 15 todetermineihe angle of the'teeth 17 as shown in In 3, while the stops29are arranged to limit the movement of the tool bar in the otherdirection or folding movement as shown in Fig. 4.

If it is desired to increase the pitch of the teeth 17 from that shownin Figs. 2 and 3, a liner or filler block such as shown at 30*, in Fig.6, maybe secured to each of the stops 30 to reduce their movement towardstops 28.

Slidably mounted in the piston rod 25 is a locking pin 31 which isretained in its locking position by means ofa spring 32, and is arrangedto retain the scarilier in its inoperative position, as shown in Figs. 4and 5. 33 is a releasing plunger for the locking pin, having a piston 34in a cylinder 35, in the upper cylinder head 20.

36 is the casing for the controlling valve 37 for controllingtheadmission and exhaust of actuating fluid to and from the cylinder-19, and 88 is an actuating lever connected to the valve 37. I i 39 is apipe leading from anysuitablc source of fluid pressure to the valvecasing 36, and 10 and 41 are pipes leading from the valve casing to thetop and bottom, respectively, of the cylinder 19. 4:2 is an exhaust portin the valve casing 35 which communicates with a chamber a3 in the valvecasing and which is open to atmosphere by means of a port 44;. 415 is aneedle valve for ad justing the size of the outletfrom exhaust port 42to the chamber 13 to control the speed of the piston in either directionwhen pressure is admitted thereto.

The pipe 40 is not connected directly with the cylinder 19, but is indirect connection with the small cylinder 35 of the piston 34 on thelocking pin releasing plunger 33, and when plunger 33-is advanced torelease the locking pin 31, as hereinafter set forth, the piston 34 willuncover a port 46 and admit pressure to the cylinder 19 above the piston24.

4t? is a cam surface in the cylinder head 20 which is engagedby thelocking pin 31 during the upward movement of the. piston 24: to shiftthe pin against the action of its spring 32, and 48 are stops on theframe of-the roller 10 engaged by the drag bars 1 1 to limit the upwardmovement of piston 24.

Assuming the parts to be in the position shown in Figs. 4' and 5, and itis desired to lower the scarifiers into operative position as shown inFigs. 1, 2 and 3, the valve 37 is shifted to admit pressure to pipe 10and place pipe 41 in communication with exhaust port as. i r i g Thepressure in pipe 40 will lirst advance the lock releasing plunger 33 andrelease locking pin 31, which will unlock the piston "2 1. In thisreleasing movement of the plunger 33, the piston 34 thereon will uncoverport 46, admit pressure to the top'of the cylinder 19, and as the'lowerend of the cylinder is open to exhaust, the piston 24: will movedownward As the exhaust is throttled by means of the needle valve 45,

the movement of the piston will be resisted by the back pressure of thefluid in the cylinder 19 below the piston 2 1 to prevent shock to thevarious parts when the limit of the movement of the piston 24 isreached.

The piston 241 is moved downwardly until the wheels 27 contact with thesurface of the road, and the teeth 17 will enter the ground and be moveddownwardly about the axis of the trunnions 15 by the forward movementofthe roller 10, until the stops 3() on the tool bar engage the stops 28on the drag bars 1 1, and the scarifier will be held in its operativeposition by the pressure of the fluidon the top of piston 24.

VVhen it is desired to raise the scarifier from its operative position,the valve 37 is reversed to admit pressure to the bottom of the cylinder19 through pipe ail and open the top of the cylinder to exhaust throughpipe 10. During the first part of the upward movement of the piston 2%,the teeth 17 will be withdrawn from the ground and the tool bar 16 willbe rocked about the axis of the trunnions 15 until the stops 30 engagethe stops 29, and during the further movement of the piston 24, thescarifier will be raised to the position shown in Figs. 4 and Justbefore the piston 24 reaches the limit of its upward movement, thelocking pin 31 will engage the cam surface 47 which will move said pinagainst the action of its spring 32, and as soon as this pin passes thecam surface, the spring 32 will shoot the locking pin 31 into a lockingrecess above the cam sur-- face 17, as shown in Fig; 5, to retainthe itslockingrecess will also shift the releasing plunger 33, so that itspiston 34 will cover port 46. V a

" The advantages of my invention result from the provision of ascarifier having its teeth so mounted that theycan be rotated about theaxis of their support so as to be moved away from the road when thescarifier is raised to its inoperative position, which enables me toreduce the height of the lift of the scarifier, and at the same timeprovide sufiicient space or clearance between the teeth and the road bedwhen the scarifier is raised to its inoperative position. This reductionin the height of the lift enables me to ,use a single actuating cylinderat the axis of the supporting or gage wheels and the axis of the dragbars is transmitted directly to the piston in the cylinder through themedium of the piston rod, without the interposition of actuating devicesbetween the connecting rod and scarifier, which are liable to becomebent and jam, which would destroy the resilient or cushioning action ofthe piston, when the scarifier engages obstructions. Inother words, thecylinder is so positioned that the line of movement of the piston iscoincident with the line of movement of the scarifier, and the teeth canbe raised by an obstruction without raising the gage wheels, and as thecylinder is short I am also enabled to directly mount it in a verticalposition on the supporting frame of the roller, which is su'flicientlyrigid to resist the strains caused by the scarifier.

The teeth are also so disposed with relation to the surface of theground to be torn up when the scarifier is lowered into operativeposition, that they will readily enter the ground by the movement ofroller and readily assume their working positions, as the movement ofthe roller will tend to force them into the ground. 7

A still further advantage results from the provision of means wherebythe angle or pitch of the teeth can readily be varied to meet therequirements of diiierent surfaces to be scarified.

Having now fully described my invention, what I claim and desire toprotect by Letters Patent is 1. A device of the character describedhaving drag bars, both pivoted at one end to permit the outer ends to beraised and lowered, gage wheels connected to the drag bars beyond thepivotal'connections of said bars, a Scarifying tool pivoted to the dragbars beyond their pivotal connections,-a power cylinder, a piston'insaid cylinder, a piston rod connected to theqpiston and the tool,thearrangement being such that when the piston is actuated the drag barsare swung about their pivotal connections and the tool is moved aboutits pivotal :conn ections tothe drag bars, and stops fornlimitlng V themovement of the tool on the drag bars.

2. The combination with a road-machine and scarifier drag-bars pivotallyconnected thereto and extending longitudinally with reference to thelineof travel of the ma' chine, of a transversely extending scarifying toolholding bar pivotally connected to the drag bars, gage wheels mounted onthe tool bar, a fluid pressure cylinder mounted onthe road machine, apiston in said cylinder, and a piston rod connected to the piston andthe tool bar, the pivotal connection between the tool bar and theconnectingrod beingyeccen- V tric to the pivotal connection between thedrag bars. and the tool-holding bar.

3. The combination with a road machine and scarifier drag bars'pivotallyconnected thereto and extendinglongitudinally with reference to the lineof travel of the machine, of a transversely extending scarifying toolholding bar pivotally connected to theon theroadmachin a piston in aidcylinder, and a piston rod connected to the piston and the tool bar, thepivotal connection be tween the tool bar and the connecting rod beingeccentric to the pivotal connection between the drag bars and the'toolholding bar. 7

4. The combination with a road machine and scarifier drag bars pivotallyconnected thereto and extending longitudinally with reference to th lineof travel of the machine, of a transversely extending scarifying toolholding bar pivotally connected to the drag bars, stops on the, dragbars and the tool bar for limiting the rotary move ment of the tool barwith relation to the dra bars, means for securing liners to one set 0stops to vary the limit of such movement, gage wheels mounted on thetool bar, a fluid pressure cylinder mounted on the road machine, apiston in said cylinder, and a piston rod connected to the piston andthe tool bar, the pivotal connection between the tool bar and theconnecting rod being eccentric to the pivoted connection between thedrag bars and the tool holding bar.

5. The combination with a road machine and scarifier drag bars pivotallyconnected thereto and extending longitudinally with reference to theline of travel or" the machine, of a. transversely extendlng scarifyingtool holding bar pivotally connected to the drag bars, gage wheelsmounted on the tool bar, the axis of said wheels beingin lin with theaxis of the pivotal connection between the drag bars and the tool bar, afluid pressure cylinder Inountedon the road machine, a piston in saidcylinder, and a piston rod connected to the piston and the tool bar, thepivotal connection between the tool bar and the connecting rod beingeccentric to thepivotal connection between the drag bars and the toolholding bar.

6. A scarifier having longitudinally extending drag bars pivotallyconnected to a road roller, a transversely extendingscaritying toolholder pivot-ally connected to. the drag bars, gage wheels pivotallymounted on the pivotal connections. between the drag bars and the toolholder. a fluid pressure cylinder, a. piston in said cylinder,

a piston rod connected to the piston, and a connection between thepiston rod and the tool holder eccentric to the pivotal connecsurecylinder, a piston in said cylinder, and

a piston rod connected to the piston at one end and pivotally connectedat its other end to the tool bar eccentric to the pivotal connectionbetween the drag bars and the tool holder. 7

8. A scarifier having longitudinally ex tending drag bars pivotallyconnected at their front ends to the rear of a road roller, a

transversely extending tool holding bar piv otally connected to the rearends of the drag bars, gage wheels for the tool holding bar, and fluidpressure means for raising and lowering the tool holding bar pivotallycon lowering the tool holding bar.

9. A machine of the type described, havnected to thetool holding barbetween the ends of the drag barsa'nd' arranged to oscillate the toolholding bar with relation to the drag bars when raising an ing pivoteddrag bars extending longitu'dinally with relation to the machine,ascarifying' tool bar extending transversely and pivotally connected tothe free ends of the drag bars, scarifying tools on the bar, gage wheelsfor regulating'the depth the tools enter'the ground, and means forraising the tool bar, said raising means being connect-ed tothe tool bareccentric to the pivotal connectlons between the tool bar and the dragbars to permit the tools to swing about the axis of the tool bar duringthe raising and lowering of the tool bar.

' In testimony of which invention, I have hereunto set my hand,atKennett Square,

Pa, on this 22nd day of November, 1920.

EARL E. BERRY.

